<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model="name" />
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model="age" />
    </div>
    <div>
      <span>性别:</span>
      <select v-model="gender">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <div>
      <button @click="add">添加/修改</button>
    </div>
    <div>
      <table border="1" cellpadding="10" cellspacing="0">
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(v, i) of arr" :key="v.id">
          <td>{{ v.id }}</td>
          <td>{{ v.name }}</td>
          <td>{{ v.age }}</td>
          <td>{{ v.gender }}</td>
          <td>
            <button @click="del(v.id)">删除</button>
            <button @click="edit(v.id)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
  <script src="../vue.js"></script>
  <script>
    // 需求1: 铺设页面, 准备初始的数据(自己手写数据结构) - 前面是数组索引+1 *作为序号
    // 需求2: 当输入框没有值, 要给用户一个提示, 必须都有值才能增加新数据 (数据驱动页面哦)
    // 需求3: 添加功能 - 想好数据结构统一对象的key
    // 需求4: 点击编辑功能, 把值赋予到输入框上(不要操作dom, 数据驱动页面)
    // 需求5: 用户修改后, 点击相同按钮 - 想想怎么判断怎么是添加还是修改的功能 (提示: 准备一个全局变量, 点过编辑按钮可以让它为true) - 实现编辑后更新页面效果
    // 需求6: 点击删除, 删除这行数据
    const app = new Vue({
      el: '#app',
      data: {
        flag: false,
        name: '',
        age: '',
        gender: '男',
        arr: [
          { id: 1, name: 'jack', age: 18, gender: '男' },
          { id: 2, name: 'rose', age: 16, gender: '女' },
        ]
      },
      methods: {
        del(id) {
          this.arr = this.arr.filter(ele => ele.id !== id)
        },
        add() {
          if (this.name === '' || this.age === '') return alert('姓名和年龄不能为空')
          if (!this.flag) {
            this.arr.push({
              id: Math.max(1, ...this.arr.map(ele => ele.id)) + 1,
              name: this.name,
              age: this.age,
              gender: this.gender,
            })
          } else {
            this.flag = false
            // 需要找到对应修改的数组对象？
            this.obj.name = this.name
            this.obj.age = this.age
            this.obj.gender = this.gender
          }
          this.name = this.age = ''
          this.gender = '男'

        },
        edit(id) {
          this.flag = true
          // 改为全局变量
          this.obj = this.arr.find(ele => ele.id === id)
          this.name = this.obj.name
          this.age = this.obj.age
          this.gender = this.obj.gender
          this.id = this.obj.id
        }
      }
    })
  </script>
</body>

</html>